Gas adsorption apparatus, end cap assembly, battery cell, battery, and electrical device

ABSTRACT

An adhesive application apparatus and a battery production line are provided. The adhesive application apparatus includes an unwinding mechanism, a first winding mechanism, an adhesive application mechanism, and a second winding mechanism. The unwinding mechanism is configured to dispose and unwind the double-sided adhesive. The first winding mechanism is configured to peel off and wind the first release paper. The adhesive application mechanism and the winding mechanism jointly define a first path, where the first path is used to guide the adhesive strip to move forward. The adhesive application mechanism includes an adhesive application member disposed on a side of the first path, where the adhesive application member is configured to applies pressure from a side of the first path to the double-sided adhesive, so as to attach the adhesive strip on an object surface. The second winding mechanism is configured to peel off and wind the second release paper.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Application 202220855179.9,filed Apr. 14, 2022 and entitled “ADHESIVE APPLICATION APPARATUS ANDBATTERY PRODUCTION LINE HAVING SUCH ADHESIVE APPLICATION APPARATUS”,which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

This application relates to the field of battery productiontechnologies, and in particular, to an adhesive application apparatusand a battery production line having such adhesive applicationapparatus.

BACKGROUND

Energy conservation and emission reduction are crucial to thesustainable development of the automobile industry. Electric vehicles,with their advantages in energy conservation and emission reduction,have become an important part of sustainable development of theautomobile industry. For electric vehicles, battery technology is animportant factor in connection with their development.

During battery production, when coating, rolling, and die-cutting havebeen performed on electrode plates, the electrode plates need to bewound to rolls and have adhesive applied thereon, for the ease ofstorage or transport. In conventional technologies, the success rate ofautomated adhesive application on electrode plate rolls is relativelylow, about 50%. When automated adhesive application on an electrodeplate roll fails, the machine needs to be shut down and adjustedmanually, which affects OEE (Overall Equipment Effectiveness, overallequipment effectiveness) of the production line.

SUMMARY

In view of this, an adhesive application apparatus and a batteryproduction line with the adhesive application apparatus need to beprovided, so as to resolve a problem in the conventional technology thatautomated adhesive application on an electrode plate roll tends to fail.

According to a first aspect, this application provides an adhesiveapplication apparatus, configured to apply a double-sided adhesive on anobject surface. The double-sided adhesive includes first release paper,second release paper, and adhesive strips. A plurality of adhesivestrips are spaced apart between the second release paper and the firstrelease paper, where the first release paper detaches from the adhesivestrip more easily than the second release paper. The adhesiveapplication apparatus includes an unwinding mechanism, a first windingmechanism, an adhesive application mechanism, and a second windingmechanism. The unwinding mechanism is configured to dispose and unwindthe double-sided adhesive. The first winding mechanism is configured topeel off and wind the first release paper. The adhesive applicationmechanism and the unwinding mechanism jointly define a first path, wherethe first path is used to guide the adhesive strip to move forward. Theadhesive application mechanism includes an adhesive application memberdisposed on a side of the first path, where the adhesive applicationmember is configured to apply pressure from a side of the first path tothe double-sided adhesive, so as to attach the adhesive strip on anobject surface. The second winding mechanism is configured to peel offand wind the second release paper.

In the foregoing solution, the double-sided adhesive with the firstrelease paper and the second release paper is used, and the firstwinding mechanism and the second winding mechanism are configured towind the first release paper and the second release paper respectively,so as to avoid the adhesive strip between the first release paper andthe second release paper from being attached to a surface of theadhesive application member or another member and prevent adhesiveapplication failure caused thereby. On the other hand, a plurality ofadhesive strips are spaced apart, and the adhesive application member inthe adhesive application mechanism is configured to apply pressure froma side of the double-sided adhesive to the double-sided adhesive, sothat the adhesive strip can be directly attached to the object surface,without an adhesive cutting process or a cutter mechanism. This avoidsthe adhesive application failure due to adhesive cutting, therebyimproving efficiency and success rate of adhesive application.

The following further describes the technical solution in thisapplication.

In any implementation, a tension assembly is disposed between theadhesive application mechanism and the second winding mechanism, and theadhesive application mechanism, the second winding mechanism, and thetension assembly form a second path. The second path is used to guidethe second release paper after being peeled to move forward, and thetension assembly can extend or shorten length of the second path. Thetension assembly is disposed between the adhesive application mechanismand the second winding mechanism, so that the second release paper canbe kept stretched on the second path. In addition, when the secondwinding mechanism does not rotate, the length of the second path isextended, so that the second release paper and the adhesive strip at theadhesive application mechanism move along the second path.

In any implementation, the tension assembly includes at least oneposition-adjustable movable wheel, and the movable wheel participates indefining the second path. When a position of the movable wheel isadjusted, the length of the second path is extended or shortened. Theposition-adjustable movable wheel is disposed, so the position of themovable wheel can be adjusted to change an arc of the second path,thereby changing a length of the second path between the adhesiveapplication mechanism and the second winding mechanism. As a result, theposition of the movable wheel can be adjusted, so that the secondrelease paper and the adhesive strip at the adhesive applicationmechanism move along the second path.

In any implementation, the tension assembly further includes a fixedwheel disposed in cooperation with the movable wheel. A gap is formedbetween the fixed wheel and the movable wheel, the gap serves as a partof the second path, and the movable wheel can move along a directiontoward or away from the fixed wheel. The fixed wheel is disposed incooperation with the movable wheel, so that when the movable wheel movesrelative to the fixed wheel, the gap between the movable wheel and thefixed wheel can be changed to change the length of the second path.

In any implementation, the tension assembly further includes a firstdriving member. The first driving member connects to the movable wheel,and the first driving member is configured to drive the movable wheel tomove. The first driving member is disposed to provide kinetic energy forthe movable wheel, so as to drive the movable wheel to move.

In any implementation, along the first path, a first guiding wheel isdisposed between the unwinding mechanism and the first windingmechanism, and the first winding mechanism and the adhesive applicationmechanism are disposed on different sides of the first guiding wheel.The first winding mechanism and the first guiding wheel jointly define athird path used to guide the first release paper to move forward, andthe first guiding wheel and the adhesive application mechanism jointlydefine part of the first path. The first guiding wheel is disposed tokeep the first release paper, the adhesive strip, and the second releasepaper all stretched after detachment, so as to facilitate the adhesiveapplication mechanism in applying adhesives.

In any implementation, along the first path, a detection apparatus isdisposed between the first winding mechanism and the adhesiveapplication mechanism, configured to detect whether any adhesive stripis present on a surface of the second release paper. A scenario, inwhich no adhesive strip is present on a surface of the second releasepaper because an adhesive strip is attached to the first release paperwhen the first release paper is detached from the adhesive strip and thesecond release paper, can be detected. This avoids missed adhesiveapplication due to absence of the adhesive strip.

In any implementation, the adhesive application member is configured tobe able to move back and forth along a direction perpendicular to theadhesive strip. The adhesive application member moves back and forthalong the direction perpendicular to the adhesive strip, so that theadhesive application member can apply perpendicular pressure to theadhesive strip from a side, opposite the adhesive strip, of the secondrelease paper. In this way, the adhesive strip is attached to the objectsurface.

In any implementation, the adhesive application mechanism furtherincludes a first tension wheel and a second tension wheel. Along thefirst path, the first tension wheel and the second tension wheel arerespectively disposed on sides upstream and downstream of the adhesiveapplication member, and the first tension wheel, the second tensionwheel, and the adhesive application member jointly define part of thefirst path. The second release paper is stretched to avoid displacementof the second release paper and the adhesive strip due to insecureplacement during movement. In addition, when the length of the secondpath is being adjusted, the tension assembly can drive the secondrelease paper and the adhesive strip to move.

According to a second aspect, this application further provides abattery production line, including the adhesive application apparatusaccording to any one of the foregoing implementations, and the adhesiveapplication apparatus is configured to apply a double-sided adhesive ona surface of an electrode plate.

BRIEF DESCRIPTION OF DRAWINGS

The drawings as a part of this application are intended for betterunderstanding of this application, and constitute a part of thisapplication. Exemplary implementations and descriptions thereof in thisapplication are intended to interpret this application and do notconstitute any improper limitation on this application.

To describe the technical solutions in the implementations of thisapplication more clearly, the following briefly describes theaccompanying drawings required for describing the implementations.Apparently, the accompanying drawings in the following description showmerely some implementations of this application, and a person ofordinary skill in the art may derive other drawings from theseaccompanying drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a double-sided adhesiveaccording to this application; and

FIG. 2 is a structural diagram of an adhesive application apparatusaccording to an implementation of this application.

DESCRIPTION OF REFERENCE SIGNS

-   100. Adhesive application apparatus; 110. unwinding mechanism; 120.    first winding mechanism; 130. adhesive application mechanism; 131.    adhesive application member; 132. first tension wheel; 133. second    tension wheel; 134. second driving member; 140. second winding    mechanism; 150. tension assembly; 151. movable wheel; 152. fixed    wheel; 153. first driving member; 160. first guiding wheel; 170.    detection apparatus; 180. second guiding wheel; and-   200. double-sided adhesive; 210. first release paper; 220. second    release paper; and 230. adhesive strip.

DESCRIPTION OF EMBODIMENTS

To make the objectives, features and advantages of this application morecomprehensible, the following further describes specific implementationsof this application in detail with reference to the accompanyingdrawings. In the following descriptions, numerous specific details areset forth in order to provide a thorough understanding of thisapplication. However, this application can be implemented in many otherways different from the ways described herein, and persons skilled inthe art can make similar improvements without departing from theconnotation of this application. Therefore, this application is notlimited by the specific implementations disclosed below.

Unless otherwise defined, all technical and scientific terms used hereinshall have the same meanings as commonly understood by those skilled inthe art to which this application belongs. The terms used herein aremerely intended to describe the specific implementations but notintended to constitute any limitation on this application. The terms“include”, “comprise”, and “having” and any other variations thereof inthe specification, the claims and the foregoing brief description ofdrawings of this application are intended to cover a non-exclusiveinclusion.

In the descriptions of implementations of this application, the term“and/or” in this application describes only an association relationshipfor describing associated objects and represents that threerelationships may exist. For example, A and/or B may represent thefollowing three cases: A alone, both A and B, and B alone. In addition,a character “/” in this specification generally indicates an “or”relationship between contextually associated objects.

In the descriptions of this application, it should be understood thatthe orientations or positional relationships indicated by the terms“center”, “vertical”, “transverse”, “length”, “width”, “thickness”,“upper”, “lower”, “front”, “rear”, “left”, “right”, “perpendicular”,“horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”,“counterclockwise”, “axial“, “ radial”, “circumferential”, and the likeare based on the orientations or positional relationships shown in theaccompanying drawings, are merely intended to facilitate thedescriptions of this application and simplify the descriptions, are notintended to indicate or imply that the apparatuses or componentsmentioned in this application must have specific orientations, or beconstructed and operated for a specific orientation, and therefore shallnot be construed as a limitation to this application.

In addition, the terms “first” and “second” are merely for the purposeof description, and shall not be understood as any indication orimplication of relative importance or any implicit indication of thenumber of technical features indicated. Therefore, a feature defined by“first” or “second” may explicitly or implicitly include at least onesuch feature. In the description of this application, the meaning of“plurality” is at least two, for example two or three, unless otherwisespecifically defined.

In this application, unless otherwise specified and defined explicitly,the terms “mount”, “connect”, “join”, and “fasten” should be understoodin their general senses. For example, they may refer to a fixedconnection, a detachable connection, or an integral connection, mayrefer to a mechanical connection or electrical connection, any may referto a direct connection, an indirect connection via an intermediatemedium, or an interaction between two elements, unless otherwise definedexplicitly. Persons of ordinary skill in the art can understand specificmeanings of these terms in this application as appropriate to specificsituations.

In this application, unless otherwise clearly specified and limited, afirst feature being “on” or “under” a second feature may mean that thefirst and second features are in direct contact, or the first and secondfeatures are in indirect contact through an intermediary. Further, thefirst feature being “on”, “above”, or “on top of” the second feature maymean that the first feature is directly above or obliquely above thesecond feature, or simply mean that the first feature is horizontallyhigher than the second feature. The first feature being “under”,“below”, or “beneath” the second feature may mean that the first featureis directly beneath or obliquely beneath the second feature, or simplymean that the first feature is horizontally lower than the secondfeature.

It should be noted that when a component is referred to as being“fastened to” or “disposed at” another component, it may be directlyfastened to the another component, or there may be a component inbetween. When a component is deemed as being “connected to” anothercomponent, it may be directly connected to the another component, orthere may be a component in between.

Currently, from a perspective of market development, application ofelectric vehicle batteries is becoming more and more extensive. Electricvehicle batteries are widely used not only in energy storage powersupply systems such as hydro, thermal, wind, and solar power plants, butalso in electric transportation tools such as electric bicycles,electric motorcycles, electric vehicles, and fields such militaryequipment and aerospace. With the continuous expansion of tractionbattery application fields, the market demand is also constantlyexpanding, and battery production is also moving towards a moreefficient direction.

Battery production includes a process for automated adhesive applicationof electrode plate rolls. To apply an adhesive on electrode plate rolls,a continuous double-sided adhesive is usually used for attaching theelectrode plates. When the double-sided adhesive has been attached tothe electrode plates, a cutter is needed to cut the double-sidedadhesive, so as to complete adhesive application. The inventor has foundthat, the cutter tends to be blunt and positioning of the cutter isunreliable. In that case, cutting failure may be caused or release paperof the double-sided adhesive may be cut, resulting in a broken tape. Inaddition, the double-sided adhesive is prone to being attached to thecutter or the adhesive application roll, causing adhesive applicationfailure and affecting device operation. Therefore, a success rate ofautomated adhesive application on the electrode plates is relativelylow.

In order to alleviate the problem of low success rate of automatedadhesive application on electrode plates, the inventor has found thatsegmented double-sided adhesive tape with double sides of release paperand a suitable adhesive application apparatus can be used to performautomated adhesive application on the electrode plates. Specifically,the adhesive application apparatus may include two winding mechanisms towind the two pieces of release paper respectively. The two windingmechanisms rotate to make the double-sided adhesive move along thepredefined path, so as to attach the segmented double-sided adhesive toan object surface by the adhesive application mechanism.

Based on the considerations above, in order to solve the problem thatthe success rate of automated adhesive application on electrode platerolls is low, the inventor has researched in depth and designed anadhesive application apparatus. When the segmented double-sided adhesivewith double sides of release paper is used, the cutter is not needed tocut the double-sided adhesive and the double-sided adhesive can beprevented from being attached to the cutter or a surface of the adhesiveapplication roll, so that the adhesive application failure due to thedouble-sided adhesive being attached to the cutter or the adhesiveapplication roll caused by the cutter being blunt or inaccuratepositioning can be avoided, thereby increasing the success rate ofautomated adhesive application on the electrode plates.

The adhesive application apparatus can be used in, but not limited to, abattery production line, and can also be configured to applydouble-sided adhesives to other objects. The battery production lineprovided in this application can be used for producing new energybatteries.

The following describes preferred implementations in this applicationwith reference to the drawings.

The adhesive application apparatus 100 illustrated in this applicationuses a double-sided adhesive 200 as shown in FIG. 1 . The double-sidedadhesive 200 includes first release paper 210, second release paper 220,and a plurality of adhesive strips 230. The plurality of adhesive strips230 are spaced apart between the second release paper 220 and the firstrelease paper 210, where the first release paper 210 detaches from theadhesive strip 230 more easily than the second release paper 220.

The first release paper 210 and the second release paper 220 areanti-adhesive paper that prevents the prepreg from sticking and canprotect the prepreg from contamination. The prepreg can be attached tothe release paper, but not securely. For example, in this application,the prepreg is the adhesive strip 230. The adhesive strip 230 can beattached to the release paper, but not securely. Two opposite surfacesof the adhesive strip 230 are adhesive, and the first release paper 210and the second release paper 220 are disposed on the two adhesivesurfaces of the adhesive strip 230 respectively, so as to isolate theadhesive strip 230 from the outside, thereby preventing the adhesivestrip 230 from being attached to another object. The two adhesivesurfaces of the adhesive strip 230 can be completely detached from thefirst release paper 210 and the second release paper 220. The firstrelease paper 210 detaches from the adhesive strip 230 more easily thanthe second release paper 220, so that when the first release paper 210and the second release paper 220 are stripped in two directions, theadhesive strip 230 stays attached to the surface of the second releasepaper 220 and is detached from the first release paper 210. For ease ofproduction, preferably, every two adjacent adhesive strips 230 areevenly spaced apart.

FIG. 2 shows the adhesive application apparatus 100 according to anembodiment of this application, configured to apply the double-sidedadhesive 200 on an object surface. In this application, descriptions areprovided based on an example, in which the object surface is a surfaceof an electrode plate roll in a battery cell. That is, the double-sidedadhesive 200 is applied to the surface of an electrode plate roll. Inanother implementation, the adhesive application apparatus 100 mayalternatively be used for applying the double-sided adhesive 200 toanother object.

As shown in FIG. 2 , the adhesive application apparatus 100 includes anunwinding mechanism 110, a first winding mechanism 120, an adhesiveapplication mechanism 130, and a second winding mechanism 140. Theunwinding mechanism 110 is configured to dispose and unwind thedouble-sided adhesive 200. The first winding mechanism 120 is configuredto peel off and wind the first release paper 210. The adhesiveapplication mechanism 130 and the unwinding mechanism 110 jointly definea first path, and the first path is used to guide the adhesive strip 230to move forward. The adhesive application mechanism 130 includes anadhesive application member 131 disposed on one side of the first path,where the adhesive application member 131 is configured to applypressure from the one side of the first path to the double-sidedadhesive 200, so as to attach the adhesive strip 230 to an objectsurface. The second winding mechanism 140 is configured to peel off andwind the second release paper 220.

The unwinding mechanism 110 is configured to fasten the windeddouble-sided adhesive 200 and unwind the double-sided adhesive 200 byrotating. For example, the unwinding mechanism 110 includes an unwindingwheel that can rotate around its own axis, and the unwinding wheel isused for setting the winded double-sided adhesive. Further, theunwinding mechanism 110 may further be provided with a driving apparatusto drive the unwinding wheel to rotate. The driving apparatus may be anelectrical motor, a heat engine, or the like.

The first winding mechanism 120 is used for winding the first releasepaper 210. When the first release paper 210 is being winded, the firstrelease paper 210 continuously strips from the adhesive strip 230, andfinally is completely detached from the adhesive strip 230. For example,the first winding mechanism 120 includes a winding wheel that can rotatearound its own axis, and the winding wheel is used for setting the firstrelease paper 210. Further, the first winding mechanism 120 may beprovided with a driving apparatus to drive the winding wheel to rotate.The driving apparatus may be an electrical motor, a heat engine, or thelike.

Along a moving direction of the adhesive strip 230, the adhesiveapplication mechanism 130 is disposed on a downstream side of the firstwinding mechanism 120, and is configured to guide the second releasepaper 220 and the adhesive strip 230. In this way, the second releasepaper 220 and the adhesive strip 230 move along the first path, and theadhesive strip 230 is pressed to be attached to the object surface. Inthis implementation, the adhesive application mechanism 130 can attachthe adhesive strip 230 to surfaces of the electrode plate rolls. In thisimplementation, “downstream” can be understood as a location or adirection, on a moving path of the adhesive strip 230, further away fromthe unwinding mechanism 110.

The adhesive application member 131 is provided on one side of the firstpath, and can apply pressure from one side of the first path to thedouble-sided adhesive 200. In the implementation shown in FIG. 1 , theadhesive application member 131 can apply pressure to the adhesive strip230 from one side, opposite the adhesive strip 230, of the secondrelease paper 220, so that the adhesive strip 230 is attached to theobject surface.

Along a moving direction of the second release paper 220, the secondwinding mechanism 140 is disposed on a downstream side of the adhesiveapplication mechanism 130. The second winding mechanism 140 isconfigured to wind the second release paper 220, and provides a pullingforce for the second release paper 220 and the adhesive strip 230 tomove along the first path. For example, the second winding mechanism 140includes a winding wheel that can rotate around its own axis, and thewinding wheel is used for setting the second release paper 220. Further,the second winding mechanism 140 may be provided with a drivingapparatus to drive the winding wheel to rotate. The driving apparatusmay be an electrical motor, a heat engine, or the like. In thisimplementation, “downstream” can be understood as a location or adirection, on a moving path of the adhesive strip 220, further away fromthe unwinding mechanism 110.

When the adhesive application apparatus 100 in the foregoing solutionsis used to apply the double-sided adhesive 200 on the object surface,the winded double-sided adhesive 200 is fastened to the unwindingmechanism 110, the first release paper 210 of the double-sided adhesive200 is winded by the first winding mechanism 120, and the second releasepaper 220 passes through the adhesive application mechanism 130 alongthe first path and is finally winded by the second winding mechanism140. The second winding mechanism 140 rotates and drives the secondrelease paper 220 and the adhesive strip 230 to move along the firstpath. When the adhesive strip 230 passes through the adhesiveapplication mechanism 130, the adhesive application member 131 in theadhesive application mechanism 130 applies pressure to the adhesivestrip 230 from one side, opposite the adhesive strip 230, of the secondrelease paper 220, so that the adhesive strip 230 is attached to theobject surface. In the foregoing process, the first release paper 210,the second release paper 220, and the adhesive strip 230 first movetogether along the first path. When the first release paper 210 movesalong the second path and is peeled off from the double-sided adhesive200, the second release paper 220 and the adhesive strip 230 continue tomove along the first path. When the adhesive strip 230 is attached tothe object surface, the second release paper 220 is winded by the secondwinding mechanism 140.

In the foregoing solution, the double-sided adhesive 200 with the firstrelease paper 210 and the second release paper 220 is used, and thefirst winding mechanism 120 and the second winding mechanism 140 areconfigured to wind the first release paper 210 and the second releasepaper 220 respectively, so as to avoid the adhesive strip 230 betweenthe first release paper 210 and the second release paper 220 from beingattached to a surface of the adhesive application member 131 or anothermember and prevent adhesive application failure caused thereby. On theother hand, a plurality of adhesive strips 230 are spaced apart, and theadhesive application member 131 in the adhesive application mechanism130 is configured to apply pressure from a side of the double-sidedadhesive 200 to the double-sided adhesive 200, so that the adhesivestrip 230 can be directly attached to the object surface without anadhesive cutting process or a cutter mechanism. This avoids the adhesiveapplication failure due to adhesive cutting, thereby improvingefficiency and success rate of adhesive application.

Refer to FIG. 2 . According to some implementations of this application,optionally, a tension assembly 150 is disposed between the adhesiveapplication mechanism 130 and the second winding mechanism 140, wherethe adhesive application mechanism 130, the second winding mechanism140, and the tension assembly 150 form a second path. The second path isused to guide the second release paper 220 after being peeled to moveforward, and the tension assembly 150 is able to extend or shortenlength of the second path.

As shown in FIG. 2 , along the moving path of the second release paper220, the adhesive application mechanism 130, the tension assembly 150,and the second winding mechanism 140 are arranged in sequence and form asecond path. When the second release paper 220 and the adhesive strip230 pass through the adhesive application member 131 in the adhesiveapplication mechanism 130, the adhesive strip 230 detaches from thesecond release paper 220, the adhesive strip 230 is attached to theobject surface, and the second release paper 220 continues to move alongthe second path.

The tension assembly 150 is disposed between the adhesive applicationmechanism 130 and the second winding mechanism 140, so that the secondrelease paper 220 can be kept stretched on the second path. In addition,when the second winding mechanism 140 does not rotate, the length of thesecond path is extended, so that the second release paper 220 and theadhesive strip 230 at the adhesive application mechanism 130 move alongthe second path.

Refer to FIG. 2 . According to some implementations of this application,optionally, the tension assembly 150 includes at least oneposition-adjustable movable wheel 151, where the movable wheel 151participates in defining the second path. When a position of the movablewheel 151 is adjusted, the length of the second path is extended orshortened.

The movable wheel 151 can move relative to the adhesive applicationmechanism 130 and the second winding mechanism 140, so that the lengthof the second path can be adjusted by adjusting the position of themovable wheel 151. In the implementation shown in FIG. 2 , the movablewheel 151 can move horizontally, and the length of the second path ischanged during such movement.

A plurality of movable wheels 151 may be provided and all participate indefining the second path. In this case, when the position of any movablewheel 151 is adjusted, the length of the second path is extended orshortened. In the implementation shown in FIG. 2 , two movable wheels151 are provided and both participate in defining the second path.

The position-adjustable movable wheel 151 is disposed, and the positionof the movable wheel 151 can be adjusted to change an arc of the secondpath, thereby changing a length of the second path between the adhesiveapplication mechanism 130 and the second winding mechanism 140. In thisway, the position of the movable wheel 151 is adjusted, so that thesecond release paper 220 and the adhesive strip 230 at the adhesiveapplication mechanism 130 move along the second path.

Refer to FIG. 2 . According to some implementations of this application,optionally, the tension assembly 150 further includes a fixed wheel 152disposed in cooperation with the movable wheel 151. A gap is formedbetween the fixed wheel 152 and the movable wheel 151, the gap serves asa part of the second path, and the movable wheel 151 is able to movetoward or away from the fixed wheel 152.

The second release paper 220 passes through the fixed wheel 152 and themovable wheel 151 in sequence or passes through the fixed wheel 152 andthe movable wheel 151 in sequence, so that the gap between the fixedwheel 152 and the movable wheel 151 forms a part of the second path.When the movable wheel 151 moves toward the fixed wheel 152, the gapbetween the movable wheel 151 and the fixed wheel 152 becomes smaller,and the length of the second path is shortened; when the movable wheel151 moves away from the fixed wheel 152, the gap between the movablewheel 151 and the fixed wheel 152 becomes larger, and the length of thesecond path is extended.

The fixed wheel 152 and the movable wheel 151 are disposed incooperation, and the fixed wheel 152 and the movable wheel 151 may bedisposed in a one-to-one correspondence. As shown in FIG. 2 , twomovable wheels 151 and two fixed wheel 152 are provided, each movablewheel 151 and a corresponding fixed wheel 152 are spaced apart, so thatwhen the movable wheel 151 moves, the gap between the movable wheel 151and the corresponding fixed wheel 152 becomes larger or smaller, therebyextending or shortening the length of the second path. In anotherimplementation, the fixed wheel 152 and the movable wheel 151 are spacedapart and may be different in quantity. For example, one movable wheel151 is disposed between two fixed wheels 152, or one fixed wheel 152 isdisposed between two movable wheels 151.

The fixed wheel 152 is disposed in cooperation with the movable wheel151, so that when the movable wheel 151 moves relative to the fixedwheel 152, the gap between the movable wheel 151 and the fixed wheel 152can be changed to change the length of the second path.

According to some implementations of this application, optionally, thetension assembly 150 further includes a first driving member 153 (notshown in the figure). The first driving member 153 connects to themovable wheel 151, and the first driving member 153 is configured todrive the movable wheel 151 to move.

The first driving member 153 is configured to provide kinetic energy forthe movable wheel 151 to move, and may be a cylinder, an electric motor,a heat engine, or the like. The first driving member 153 is disposed toprovide kinetic energy for the movable wheel 151, so as to drive themovable wheel 151 to move.

Refer to FIG. 2 . According to some implementations of this application,optionally, along the first path, a first guiding wheel 160 is disposedbetween the unwinding mechanism 110 and the first winding mechanism 120.The first winding mechanism 120 and the adhesive application mechanism130 are disposed on different sides of the first guiding wheel 160. Thefirst winding mechanism 120 and the first guiding wheel 160 jointlydefine a third path for guiding the first release paper 210 to moveforward, and the first guiding wheel 160 and the adhesive applicationmechanism 130 jointly define part of the first path.

As a point where the first release paper 210 is separated from theadhesive strip 230 and the second release paper 220, the second guidingwheel 180 can define, together with the first winding mechanism 120, thethird path that the first release paper 210 moves on, and can furtherdefine, together with the adhesive application mechanism 130, the firstpath that the second release paper 220 and the adhesive strip 230 moveon.

The first guiding wheel 160 is disposed to keep the first release paper210, the adhesive strip 230, and the second release paper 220 stretched,so as to facilitate the adhesive application mechanism 130 in applyingadhesives.

Refer to FIG. 2 . According to some implementations of this application,optionally, along the second path, a second guiding wheel 180 isdisposed between the adhesive application mechanism 130 and the secondwinding mechanism 140. The adhesive application mechanism 130 and thesecond winding mechanism 140 are disposed on different sides of thesecond guiding wheel 180. The adhesive application mechanism 130, thesecond guiding wheel 180, the tension assembly 150, and the secondwinding mechanism 140 jointly define the second path. Preferably, asshown in FIG. 2 , the second guiding wheel 180 is between the adhesiveapplication mechanism 130 and the tension assembly 150.

Refer to FIG. 2 . According to some implementations of this application,optionally, along the first path, a detection apparatus 170 is disposedbetween the first winding mechanism 120 and the adhesive applicationmechanism 130, and is configured to detect whether any adhesive strip230 is present on a surface of the second release paper 220.

The detection apparatus 170 is configured to detect whether any adhesivestrip 230 is present on a surface of the second release paper 220. Ascenario, in which no adhesive strip 230 is present on a surface of thesecond release paper 220 because an adhesive strip 230 is attached tothe first release paper 210 when the first release paper 210 is detachedfrom the adhesive strip 230 and the second release paper 220, can bedetected. This avoids missed adhesive application due to absence of theadhesive strip 230.

The detection apparatus 170 may be an optical detection mechanism, andcan determine whether any adhesive strip 230 is present on the surfaceof the second release paper 220 based on different surface colors of thesecond release paper 220 and the adhesive strip 230.

Refer to FIG. 2 . According to some implementations of this application,optionally, the adhesive application member 131 is configured to be ableto move back and forth along a direction perpendicular to the adhesivestrip 230.

The adhesive application member 131 moves back and forth along thedirection perpendicular to the adhesive strip 230, so that the adhesiveapplication member 131 can apply perpendicular pressure to the adhesivestrip 230 from a side, opposite the adhesive strip 230, of the secondrelease paper 220, so that the adhesive strip 230 is attached to theobject surface.

In the implementation as shown in FIG. 2 , the adhesive applicationmember 131 is connected to the second driving member 134, and the seconddriving member 134 is configured to provide kinetic energy for theadhesive application member 131 to move back and forth perpendicular tothe adhesive strip 230, where the second driving member 134 may be acylinder, a heat engine, an electric motor, or the like.

Refer to FIG. 2 . According to some implementations of this application,optionally, the adhesive application mechanism 130 further includes afirst tension wheel 132 and a second tension wheel 133. Along the firstpath, the first tension wheel 132 and the second tension wheel 133 arerespectively disposed on sides upstream and downstream of the adhesiveapplication member 131, and the first tension wheel 132, the secondtension wheel 133, and the adhesive application member 131 jointlydefine part of the first path.

The first tension wheel 132 and the second tension wheel 133 are used tostretch the second release paper 220, so as to avoid displacement of thesecond release paper 220 and the adhesive strip 230 due to insecureplacement during movement. In this way, the second release paper 220 andthe adhesive strip 230 are driven to move when the tension assembly 150is adjusting the length of the second path.

According to some implementations of this application, as shown in FIG.2 , this application provides the adhesive application apparatus 100that uses the double-sided adhesive 200 shown in FIG. 1 . The adhesiveapplication apparatus 100 includes the unwinding mechanism 110, thefirst winding mechanism 120, the adhesive application mechanism 130, thetension assembly 150, and the second winding mechanism 140. When thedouble-sided adhesive 200 is unwound by the unwinding mechanism 110, thefirst guiding wheel 160 and the first winding mechanism 120 jointlydefine a moving path of the first release paper 210, and the path isdenoted as the third path. The first guiding wheel 160 and the adhesiveapplication mechanism 130 jointly define a moving path of the secondrelease paper 220 and the adhesive strip 230, and the path is denoted asthe first path. The adhesive application mechanism 130, the tensionassembly 150, and the second winding mechanism 140 jointly define amoving path of the second release paper 220 that is detached from theadhesive strip 230, and the path is denoted as the second path.

When the adhesive application apparatus 100 in the foregoing solutionsis used to apply the double-sided adhesive 200 on the object surface,the winded disposed double-sided adhesive 200 is fastened to theunwinding mechanism 110, the first release paper 210 of the double-sidedadhesive 200 is winded by the first winding mechanism 120 along thethird path, and the second release paper 220 and the adhesive strip 230pass through the detection apparatus 170 along the first path, wherewhether any adhesive strip 230 is present on the surface of the secondrelease paper 220 is detected, and reaches the adhesive applicationmechanism 130. The second release paper 220 and the adhesive strip 230pass through the first tension wheel 132 and the adhesive applicationmember 131 successively, the second release paper 220 and the adhesivestrip 230 are separated at the adhesive application member 131, and thesecond release paper 220 that is separated from the adhesive strip 230continues to pass through the tension assembly 150 along the second pathand reaches the second winding mechanism 140. In the adhesiveapplication mechanism 130, the second release paper 220 is stretchedbetween the first tension wheel 132 and the second tension wheel 133,and the second driving member 134 drives the adhesive application member131 to apply pressure to the adhesive strip 230 from one side, oppositethe adhesive strip 230, of the second release paper 220. Then the secondwinding mechanism 140 stops rotating, the movable wheel 151 in thetension mechanism moves along a direction away from the fixed wheel 152.In this way, the second path is extended, driving the second releasepaper 220 and the adhesive strip 230 in the adhesive applicationmechanism 130 to move forward, and an adhesive is applied on the objectsurface. When the adhesive application is complete, the second windingmechanism 140 continues rotating to wind the second release paper 220,and the movable wheel 151 is restored to an initial position, so as toprepare for the next adhesive application.

This application further provides a battery production line, includingthe adhesive application apparatus 100 according to any one of theforegoing implementations, and the adhesive application apparatus 100 isconfigured to apply a double-sided adhesive 200 on a surface ofelectrode plates.

In conclusion, it should be noted that the foregoing examples are merelyintended for describing the technical solutions of this application butnot for limiting this application. Although this application isdescribed in detail with reference to the foregoing examples, persons ofordinary skill in the art should understand that they may still makemodifications to the technical solutions described in the foregoingexamples or make equivalent replacements to some or all technicalfeatures thereof without departing from the scope of the technicalsolutions of the examples of this application. They should all fallwithin the scope of claims and summary in this application. Inparticular, as long as there is no structural conflict, the varioustechnical features mentioned in the implementations can be combined inany manners. This application is not limited to the specificimplementations disclosed in this specification, but includes alltechnical solutions falling within the scope of the claims.

What is claimed is:
 1. A gas adsorption apparatus, applicable to abattery cell, and comprising: a main body, containing a chamber; a firstpressure relief portion, disposed on the main body, and configured to beactuated when an internal pressure or temperature of the battery cellreaches a first threshold, so as to implement communication between thechamber and an interior of the battery cell; and a gas adsorption unit,disposed in the chamber, wherein the gas adsorption unit comprises asealing element and an adsorbent, the adsorbent is configured to absorba gas generated by the battery cell in use, the sealing element isconfigured to seal the adsorbent, and the sealing element is configuredto allow passage of gas and prevent passage of liquid.
 2. The gasadsorption apparatus according to claim 1, wherein a water vaporpermeability of the sealing element is less than 30 g × 25 µm/m² × 24 h× 0.1 MPa.
 3. The gas adsorption apparatus according to claim 1 or 2,wherein the gas adsorption apparatus comprises a plurality of gasadsorption units.
 4. The gas adsorption apparatus according to claim 3,wherein adsorbents in the plurality of gas adsorption units aredifferent from each other, so as to absorb different types of gases. 5.The gas adsorption apparatus according to any one of claims 1 to 4,wherein the adsorbent comprises a mixture of basic oxide and hydroxide.6. The gas adsorption apparatus according to claim 5, wherein a molarratio between the hydroxide and the basic oxide in the mixture is 1: 1to 1:
 10. 7. The gas adsorption apparatus according to any one of claims1 to 6, wherein both the main body and the first pressure relief portionare made of metal.
 8. The gas adsorption apparatus according to any oneof claims 1 to 7, wherein the first pressure relief portion is recessedtoward an exterior of the chamber against an inner surface of the mainbody.
 9. The gas adsorption apparatus according to any one of claims 1to 8, wherein the gas adsorption apparatus further comprises: agas-permeable film, covering the first pressure relief portion, whereinthe gas-permeable film is configured to allow passage of gas and preventpassage of liquid.
 10. An end cap assembly, applicable to a batterycell, and comprising: an end cap; an insulation piece, mounted on a sidethat is of the end cap and that is close to an interior of the batterycell; and the gas adsorption apparatus according to any one of claims 1to 9, wherein the gas adsorption apparatus is mounted in the insulationpiece and/or the end cap.
 11. The end cap assembly according to claim10, wherein the main body comprises a first outer surface oriented backfrom the end cap, and the first pressure relief portion is disposed onan outer surface of the main body other than the first outer surface.12. The end cap assembly according to claim 10, wherein the firstpressure relief portion is located on a side that is of the main bodyand that is close to the end cap.
 13. The end cap assembly according toany one of claims 10 to 12, wherein the insulation piece contains acavity configured to accommodate the gas adsorption apparatus.
 14. Theend cap assembly according to any one of claims 10 to 13, wherein theend cap assembly further comprises: a second pressure relief portion,disposed in the end cap, wherein the second pressure relief portion isconfigured to be actuated when an internal pressure or temperature ofthe battery cell reaches a second threshold, so as to release theinternal pressure of the battery cell, wherein the first threshold isless than the second threshold.
 15. The end cap assembly according toclaim 14, wherein the end cap assembly further comprises: a positionlimiting structure, disposed in the end cap and/or the gas adsorptionapparatus, and configured to prevent the gas adsorption apparatus fromcontacting the second pressure relief portion.
 16. A battery cell,comprising the gas adsorption apparatus according to any one of claims 1to
 9. 17. A battery, comprising the battery cell according to claim 16.18. An electrical device, comprising the battery cell according to claim16.
 19. A method for manufacturing a battery cell, comprising: providinga housing, wherein an end opening is made on the housing; providing anelectrode assembly; providing an end cap assembly, wherein the end capassembly comprises: an end cap; an insulation piece, mounted on a sidethat is of the end cap and that is close to an interior of the batterycell; and a gas adsorption apparatus, wherein the gas adsorptionapparatus is mounted in the insulation piece and/or the end cap; the gasadsorption apparatus comprises: a main body, containing a chamber; afirst pressure relief portion, disposed on the main body, and configuredto be actuated when an internal pressure or temperature of the batterycell reaches a first threshold, so as to implement communication betweenthe chamber and an interior of the battery cell; and a gas adsorptionunit, disposed in the chamber, wherein the gas adsorption unit comprisesa sealing element and an adsorbent, the adsorbent is configured toabsorb a gas generated by the battery cell in use, the sealing elementis configured to seal the adsorbent, and the sealing element isconfigured to allow passage of gas and prevent passage of liquid;letting the electrode assembly be accommodated in the housing; andfitting the end cap to the end opening, wherein the end cap is connectedto the housing to form a cavity configured to accommodate the electrodeassembly.